To provide a wireless network system capable of realizing redundancy of wireless communication at a low cost and with a simple configuration.

A microprocessor 51 controls update of a network variable 550 and data communication with a wireless remote control 1 and another wireless gateway 5, according to processing in conformity to a LonTalk firmware 530. In the concrete, if data are received through a transceiver 60 from the wireless remote control 1, it is memorized as an input network variable 552. Then, if an output network variable 554 is updated based on the input network variable 552, the output network variable 554 is transmitted to the wireless gateway 5 of a master unit through a wired network N, according to processing in conformity to the LonTalk firmware 530.